The GE Security 601b and 601sb are fiber optic serial digital video transmitters and receivers that ensure signal integrity over distances up to 8.9 miles (14 km) for 601b and 25 miles (40 km) for 601sb. They comply with CCIR 601 and SMPTE 259M standards and support one-way video transmission with embedded audio through multimode or single mode fiber. Features include built-in diagnostics, a 10 dB optical budget, and various environmental tolerances, with customizable ordering options available.